Added onDisconnected callback called after calling db:disconnect.

Updated integration tests

Merge remote-tracking branch 'origin/master'

Implemented custom reconnect algorithm

Significantly increased performance of prepared statements after reconnect

Added reference counting leak check to integration test

Fixed setSSLSettings crashing

Added experimental management of active database instances using weak…

… tables

Fixed incorrect name for auto reconnect function

Update README.md

Added lua integration test

Fixed several bugs